Claude Code Security and Magecart: Getting the Threat Model Right

Magecart attacks (malicious code injected into e-commerce sites to steal payment data) often hide in third-party resources like images or scripts that never enter a company's code repository, making them invisible to static analysis tools like Claude Code Security. Claude Code Security is designed to scan code you own, so it cannot detect malicious code injected at runtime through compromised external libraries, CDNs (content delivery networks that distribute files globally), or data hidden in binary files like favicons, which means repository-based scanning has a fundamental blind spot for this attack class.